minimized danger of runaway tube current when amplifier is unattended.

Also since most bias voltage supply filter networks tend to be very simple single diode or half wave, there is usually a great deal of ripple in the most sensitive signal path in the amplifier – the grid! And active bias system is also an opportunity to design a bias supply with extremely low levels of ripple. This adds a sense of stillness and low-level detail not obtainable with standard bias voltage supplies.

Compact 4 x 9cm. Easy to place in chassis.

Price is for one piece of modules which can actively supply 2 power tubes for single ended stereo (ie convert cathode bias to fixed bias). module can also be purchased as a pair which can be used to supply 4 power tubes for push pull.